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38 pj 1
/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/**
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 ------------
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 CVS :        $Id: tskmsg.c,v 1.3 2003-12-10 16:54:59 giacomo Exp $
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 File:        $File$
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 Revision:    $Revision: 1.3 $
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 Last update: $Date: 2003-12-10 16:54:59 $
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 ------------
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**/
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/*
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 * Copyright (C) 2002 Paolo Gai
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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#include <stdarg.h>
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#include <ll/ll.h>
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#include <arch/stdlib.h>
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#include <arch/stdio.h>
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#include <arch/string.h>
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#include <kernel/config.h>
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#include <kernel/model.h>
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#include <kernel/const.h>
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#include <sys/types.h>
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#include <kernel/types.h>
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#include <kernel/descr.h>
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#include <errno.h>
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#include <kernel/var.h>
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#include <kernel/func.h>
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#include <tracer.h>
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/*
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  The running task (pointed by exec_shadow) sent a message m to the
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  scheduling module that handle the task p.
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  If the message has value NULL the behavior should be the
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  task_endcycle primitive behavior, and an endcycle tracer event is
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  generated.
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*/
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int task_message(void *m, PID p, int reschedule)
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{
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  LEVEL l;            /* for readableness only */
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  int retvalue;
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  if (p == NIL) p = exec_shadow;
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  if (reschedule) {
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    proc_table[exec_shadow].context = kern_context_save();
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    kern_epilogue_macro();
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    l = proc_table[p].task_level;
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    retvalue = level_table[l]->public_message(l,p,m);
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    exec = exec_shadow = -1;
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    scheduler();
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    kern_context_load(proc_table[exec_shadow].context);
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  } else {
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    SYS_FLAGS f;
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    f = kern_fsave();
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    l = proc_table[p].task_level;
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    retvalue = level_table[l]->public_message(l,p,m);
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    kern_frestore(f);
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  }
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  return retvalue;
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}